STUDIES ON HAZELNUT BREEDING IN NORTHERN CHINA
More than 2,000 hybrid seedlings from the interspecific cross of C. heterophylla x C. avellana have been identified and evaluated. 10 fine strains including 81–21 and 84–402 have been screened out. These strains compared with the fine lines of C. heterophylla have many advantages: the nut weight increased of 72%; the per unit area yield increased of 71.9%; the average rate of kernel yield increased of 33.4%; the average thickness of shell decreased of 34%; the average index of kernel smoothness decreased of 2.8 grade. The cold hardiness of these strains was strong and most of them can survive the winter normally. The crossing of C. heterophylla x C. avellana has therefore great potentialities and bright future in northern China.